Relieving attachment for lathes.



E. W. BLUM, W. T. S. JOHNSON & F. KROPF. RELIEVING ATTACHMENT FORLATHES. APPLIOATION FILED (FAILS, 1910.

. 971,243 Patented Sept..27,1910.

2 BHBETSBHIIIIT 1.

E. w. BLUM,W. T; s JOHNSON & i". KROPP. RELIEVING ATTACHMENT FDR LATHES.

APPLIUATION TILED JAN.3,1910

Patented Sept. 2'7, 1910.

H UNITED sTA'ras PATENT QFFIOE.

'EDWARD W. BLUM, WILLIAM T. S. JOHNSON. AND FREDERICK KROPR'OFCINCINNATI, OHIO, ASSIGNORS TO THE BRADFORD MACHINE TOOL COMPANY, OFCINCINNATI,

01110, A conrona'rron or OHIO.

git...

- To all whom it may concern:

Be it known that we, EDWARD W. Bram,

:"WILLIAM T. S. JOHNSON, and Fmnnnucn "KROP1\, citizens of theUnitedStates, re-

siding at Cincinnati, in the county of Hamilton' and' State of Ohio,have invented cer tain-new and useful Improvements in RelievinAttachments for Lathes,'oi which the f'o lowing is a specification.

-' in lathe attaohn'ients for turning irregular our invention relates toan improvement forms or eccentric surfaces, and, as illustrated,i1sapplied to the front of the lathe.

One of the ob ects of our invention IS to regular forms or eccentricsurfaces with a -rotating cam actuating oscillating mecha- -I nsm forfeeding a cutting tool to and from the work, with means for quickly andconveniently changing the length of ostillating "stroke. :Another objectof our invention is to provide a lathe attachment. for controlling thetool movement'to and from the .Kifiork with a system of change gearing,in train with' one of; the gears of the lathe spindle and 'withintermediate means for converting rotary into oscillating motion,whereby a given niilmbe'r of tool aetuations can he had "Bgiindecl orvaried. by changing the speed tool feet} with means whereby the work canbe delic cly adjusted relative to the cutting 1 tool an driving means.

6- all. i.

\ Var; its tithe; features, and detais of our: jinvent In are .m'orefully set :fort in the ioa-ofjthe accompanying gwings,

enact 'vation of the transmission gear "a cafiattire s inal andoscillating mechanism, a; ten oni'line mg/a,

Fig. it is In [on lineman,

i ani in a Specification of Letters Patent.

Application filed Mummy 3. 1910. Serial No. 536,078.

provide a lathe attachment fol-turning i1-' terrain of; part of thisspecific ion, in

re 1 isafroiit elevation of a lathe" r attachment applied. Fig.2 fis anRELIEVING ATTACHMENT FOR LATHES.

Patented Sept. 27, 1910.

2! l'hig. 1. Fig. 8 is a section on line 10,11, Fig. 7. Fig. 9 is asection on line a, c, Fig. 2. Fig. 10 is a section on line 1), '0, Fig.2. Fig. 11 is a detail elevation of the main driving gear of theattachment in mesh with the spindle gear. Fig. 12 is a Section on lineit, It, Fig. lfl.

As illustrated, our invention is adapted for turning a series ofeccentric sin-liners uponhorizontally fluted cutting tools, as,for-instance, reamers, in providing a relieving surface for the cuttingsin rear of the cutting edges of the tool. The lathe cutting tool is fedforward by a positive power feed and quickly returned after apredetermiiml feed to free the cutting tool from its vuttinig; plisitionfor a second opera tion. e

1n the drawings a. three point cam is pro- 'vid'ed for actuatingoscillating ,mechanism for conveying reciprocating movements oithe'lathe cutting toohlivith the i'otat-io -i'of the cam equal to that{of the lathe spindle. By varying the 's iced of-the camifroni that ofthe lathe spindle a ivcn construction of cam can he em 'iloyedfaitvaryingdhe lininher of cutting tool rceiprocationsduring a givenrotation of the spindle. l urther, in providing the oscillatingmechanism with means for adj ustin-g thei length of; oscillating strokevaryingdiameters or depths of out upon the work can bc had withoutclianging the cam- These features are highly advantageoi s in that agiven cam may be employed for a variety of uses.

Fig. 7 is an enlarged section on line 2,

In the drawings 1 represents alaithe bed,-

2 the head stock, 3' tire icarriagc provided with the usual toolliolding-slide4.. i

' 5 represents the hale-k gear 1nountcd on the spindle. i I

The head stock and carriage may be of any known form ofrcons'trm'rtionand'does not form a part of ouryihvention. i

(3 represents a gear in; mesh with the-gear '5 upon the spindle,adjustably mounted upon a disk 7, fixedlto the shaft 8. NYhi-le the gear(3 is shownlin mesh with the-back gear'oi the spindle, it is obviousthat the same may be in train with any gear. on the c Fit.

tie

spindle or driven tl i'ereby. The shaft .8 is

journaled upon a bracket 9 fixed to the head stock projecting therefromfor sup 'iorting various elements of our attachment.-

10 represents a gear fixed to the. end of shaft; 8. D

11 represents a swinging quadrant' ournaled upon a sleeve 12, (see Fig.10), which in turn is mounted upon the shaft 8 and adjacent to thebracket arn'is 13 formed upon the bracket 9.' The quadrant is providedwith a curved slot 14, through which a lock screw 15 passes, for lockingthe quadrant. in an adjusted position to the bracket. arm 12-3. 16, 17represent compound intermediate change gears journaled upon a stud shaft18, fixed to and projected from the quadrant. The gear 16 in mesh withgear 10 on shaft 8, and gear 17 is in mesh with gear 11) upon the camshaft 20 journalcd in a bearing formed in the bracket 9. The swingingquadrant 11 is provided to permit of the interclumgeability of thegearing mounted thereon for producing 'arying ratios of speed betweenthe spindle and cam shaft 20. 21 represents a cam fixed upon the shaft20, and, as illustrated, is a three point cam having three eccentricsurfaces 22, terminat ing with off-sets.

23 represents an oscillating frame fixed to a stud shaft 24, (see Fig..4) journaled with in a bearing formed in the bracket 5). Said frame 23is provided with an arm extension supporting a roller 26 adapted totravel upon the periphery of the cam 21. rocking the frame 23 with thestud shaft 24 as the axis therefor. The oscillating frame 23 is providedwith a slidewa v supporting a slide-block 2?, (see Fig. 4) and adjustedto and from the axis'by means of the screw rod 28 supported with theframe 23. 2! represents a link pivotally connected opposite to the-s-lide-block at one end and to the lever arm 30 at its opposite endvThe arm 30 is preferably fixed upon a sleeve journaled with a bearingformed upon the bracket 9. 31 represents a rock shaft splined within thesleeve 30, (see. Figs. 3 and ll) thereby permitting longitudinalmovement of the rock shaft 31. Thus, as the oseillatii-i'g frame 223 isactuated by the rotation of'the cam 21 it. will swing the free end ofthe frame 23 in a direction according to the outline of the cam surfaceupon which the roller 26 is bearing, in this instance either to or fromthe head sttxr-k, conveying such rocking action to the rock shaft 31through tholink and arm connections.

The arc of swing of the oscillating frame is always of such a degree asimparted thereto according to the peripheral outline of the cam. Theangle of oscillatlon or rocking action transmitted to the rock shaft 31,however, can be increased or decreased by adjusting the slide-block toor from the axis of the oscillatingframe 23. The action controls thefeed of the tool relative to the work, and in consequence, the depth ofcut.

32 represents a spring, one end of which is fixed to the bracket 9, withthe opposite end connected to the oscillating frame 3, for} maintainingthe roller under tension upon the periphery of the cam and providing anautomatic return movement of the oscillating mechanism, when the camoffsets and roller c incide. From the shaft 31 the os cillating motionis conveyed to the cutting tool. through intermediate flexibleconnections, compensating for the feed of the tool to and from the lathecenter and longitudinallv with the feed of the carriage upon the lathebed.

33 represents a bearing bracket fixed upon one edge of the carriageapron, through which the rock shaft 3t projects and is connectedtherewith by means of a collar 34, lixed to the shaft 31 upon one sideof the bearing of the bracket- 33 and an abutting shoulder formed uponone member of the universal eoupling ifigi fixed -to the shaft3l.Through this connetwion the shaft 31 is free to oscillate and movelongitudinally with the carriage and apron feed upon the lathe bed.

36 represents a two part shaft. one member telescoping within the other.in connection with the universal coupling 3.3 at one end and with theuniversal coupling 37 at the opposite end.

.38 represents a stud shaft journaled within a tool holder base plate 39fixed upon the carriage slide 4. Said shaft- 38 is connected toone'member of'thenniversal coupling 37, and held against displacementwithin the base plate by means of a set'screw it, with its inner endengaging into a peripheral groove formed upon the shaft (See Figs. (3and 8). i

42 represents a rack gear segmentfixed upon the stud shaft 38, in meshwith ra'ck teeth formed upon the slide nut (See Figs. 7 and 8).

114 represents a screw rod having a threaded engagement with the slidenut 43, and journaled within abearing formed within the compound toolholder or slide 45. slidabl "mounted upon the base plate 23! Thecompound tool holder is adapted to receive the usual tool post andcutting tool. Thus. as the stud shaft. 38 is .roeked through itsconnection with the oscillating,

the

its holder initialliy relative to the work and independent of .eedimparted to the tool holder by means of the oscillating mechanism.

46 represents a spring, one end bearing against the base 39, theopposite eiid'again'st flange of the 'disk 47, adjustably mounted uponthe nut ,43, to assist spring 32 in the automatic return movement of thevarious parts of the attachment.

In settin the work between the lathe centers, it is c amped in any knownmanner to the spindle approximately gaged relative to the cutting toolto its initial POlIlt'D]? position for commencement of cut, in .orderthat ro er time aetuations are had in the tool ee upon the rotation ofthe work, it

- is delicately set by the'following instrumentalities1- 3 3 l Asbeforedescribed, the gear-ii is adjustably" coniiected upon the disk 7. Thead-' .justinent being made through the provision of a series of circularslots 48 fOIll'ledlll the gear 6, through which the set bolts 49,carried by thedisk 7,, pihjec't. To accurately set the work relafive to,the time actuation of the cutting tool the bolts 49 are loosened, afterflilclktlle spindleand work are revolved, lltflVUlVl'tig the gear (3loosely upon the disk 7 the required'degree and tlie set nuts againtightened,

By this means proper coordinate ad ustment of the work canbe hadrelative to the reciprocation of the cutting tool. d ith the three pointcam, as illustrated, three reci 'irocating movements of the tool can behad to and from the work, with the cam rotating, at the same speed asthe lathe spindle, this will finish the work atOLilldhidlB peripherywith three relieving or .eccei'i;tric nuts. If, however, the speed ofthe camshaft is cl'ianged, say 'to make two revolutions to one of thespindle, six

reciprocating movements of. the tool are had.

Having described claim-i-A t. v

LA ,device of the class described, in combination with a iathe spindle,drive therefor and carriage, of a rotating cam, a ten' ofgeai'ingbetweenthecam and spindle drive, interchangeable foi varying the relative'ratio-ofspeed between the spindle and cam, a tool holding slideupon the lathe car riage, a 'rock shaft in connection with said our invention," we

tool slide, and iiitern'iediate connections be} tween said shaft and(jittl'l for reciprocating said shaft,

2. lathe attaehu'ient foi reciprocating the tool slide thereof, of" arotating cam, means for rotating said cam, a pivoted frame I engagingthe periphery of said cam for oscillating said fran'ie, atool slide., arock shaft in connection with said tool slide, and means in connectionwith said rock shaft and oscillating frame adapted to be adjusted to andfrom the axis of said oscillating frame for changing the length ofoscillating stroke to said rock shaft.

3. In a device of the class described, in combination with a lathespindle, driving mechanism therefor and carriage, of a rotating cam,means in connection with said driving mechanism ,andcani for rotatingthe same, a tool slide on the carriage, oscil lating mechanisminterposed between'said' tool slide and cam actuated by said cam, andmeans for chaiigiii the-length of oscillating stroke to said osci latingmechanism.

4. In a device of the class described, in combination with a lathespindle, driving 'mechanism 'therefor and carriage, of a rotating cam,means in connection with said driving mechanism and cam for rotating.the same, means for interchangeably varying the relative rotationbetween cam and driving mechanism, a tool slide on tlie'carriage,oscillating mechanism interposed between said tool slide and cam, andmeans for changing the length of oscillating stroke to said oscillatingmechanism.

5. A device of the class described, in combination with a lathe spindle,drive therefor and carriage, of a rotating rain, means in connectionwith said spindle'drii'e for rotating the cam, oscillating mechanismactuated by said cam, a shaft movable with the carriage, means inconnection with said os- "cillating mechanism and shaft for conveyingoscillating motion to said shaft, means for changing the oscillatingmovement, to said oscillating mechanism, a tool holding. slide "upon thelathe carriage and intermediate and shaft for reciprocating said slide,and' means toradjusting said stile to and from the lathe'spindleindependent of said recip rocation.

7. In adevice of the class described, in

combination with a lathe. spindle, drive therefor and carriage, ot arotating cam,

meansuin connection with said spindle drive for rotating; the cam, astilaft movable with the carriage, means inter {Used between said shaft.and cam for convening rotary iiito oscillating motion, a tool oldingsiide upon the lathe carriage, intermediate connections said relativeactuation, and means for 00- hetween said slide and shaft forreciprocatordinately adjusting the Work upon the ing said slide, andmeans for coordinately spindle, cam driving means and cutting tool, 16ad usting the work upon the spindle, cam initially.

5 driving, means and cutting tool, initially. In testimony whereof, Wehave hereunto 8. In a lathe attachment for controlling Wt 0111' Mold.

the feed of its tool slide and tool, means in- I .EDVVARD W. BLUM.terposed between the lathe spindle drive and WILLIAM T. S. JOHNSON.'lool slide for converting rotary into oseil- I FREDERICK KROPF.

10 lating motion in coordinate relative actua- Witnesses:

tion. of tool feed with the rotation of the Omvnn B. Knrsnn, spindle,means for interchangeably Varying EMMA SrENnn.

